Quickload 264Win mag Question

[Divernhunter]

I now have a load of 62grs IMR7828SSC with a 140gr Partition bullet. It was that max load that I found. I was hoping for a bit more speed.
Can someone check and see if I can increase the powder charge safely and how much? Thanks in advance.---Doug

 

[SJB358]

Doug, we would need your H20 capacity of a fired case or three from your 264 along with the barrel length and OAL to give you real numbers. I'll gladly run it if you get that.

 

[Ridgerunner665]

I'm still learning QuickLoad...but from what I'm seeing you are about maxed out where you're at.

What speed are you getting?

If I'm doing this anywhere near right...you should be at around 2,950 fps for a 24" barrel...or 3,025 for a 26" barrel.

 

[SJB358]

I'm still learning QuickLoad...but from what I'm seeing you are about maxed out where you're at.

What speed are you getting?

If I'm doing this anywhere near right...you should be at around 2,950 fps for a 24" barrel...or 3,025 for a 26" barrel.

That's kinda weak RR. I run 3180 pretty easily with RL25 and Retumbo. That's running around 63k with the AB and BT.

 

[Ridgerunner665]

I saw some loads at 3125 fps or so...just didn't want to say the wrong thing and have him start throwing more powder in there...lol.

And the speeds I quoted were both with IMR 7828SSC...just below max using the default case capacity, etc.

 

[SJB358]

Here is what I have using the stock H20 capacity

Cartridge : .264 Win. Mag.
Bullet : .264, 140, Nosler PART SP 16321
Useable Case Capaci: 75.760 grain H2O = 4.919 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 26.0 inch = 660.4 mm
Powder : IMR 7828 SSC

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-20.0 73 52.40 2571 2054 33182 11475 94.3 1.671
-18.0 75 53.71 2633 2156 35418 11807 95.4 1.629
-16.0 77 55.02 2696 2260 37803 12122 96.4 1.584
-14.0 79 56.33 2759 2366 40348 12417 97.2 1.534
-12.0 80 57.64 2821 2475 43062 12693 98.0 1.488
-10.0 82 58.95 2884 2585 45959 12947 98.6 1.444
-08.0 84 60.26 2945 2697 49035 13177 99.1 1.400
-06.0 86 61.57 3007 2810 52283 13384 99.5 1.359
-04.0 88 62.88 3067 2925 55732 13564 99.8 1.319 ! Near Maximum !
-02.0 89 64.19 3128 3041 59399 13718 100.0 1.281 ! Near Maximum !
+00.0 91 65.50 3187 3158 63301 13844 100.0 1.244 ! Near Maximum !
+02.0 93 66.81 3246 3276 67453 13960 100.0 1.209 !DANGEROUS LOAD-DO NOT USE!
+04.0 95 68.12 3305 3395 71875 14072 100.0 1.175 !DANGEROUS LOAD-DO NOT USE!
+06.0 97 69.43 3363 3515 76587 14180 100.0 1.142 !DANGEROUS LOAD-DO NOT USE!
+08.0 99 70.74 3420 3636 81613 14284 100.0 1.110 !DANGEROUS LOAD-DO NOT USE!
+10.0 100 72.05 3477 3758 86979 14383 100.0 1.080 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 91 65.50 3307 3400 75609 13337 100.0 1.154 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 91 65.50 3008 2813 51143 14025 97.3 1.365


It looks like your about at the top of 63K. So, seeing as your already attaining the top speeds, I'd be cautious about leaning too much harder on it.

 

[Divernhunter]

First I must say I am sorry. I thought I posted this in the Reloading forum not the hunting one.

I guess I might leave well enough alone. I am getting 3181FPS and SD 17. I do wish I could get the SD lower but hard to argue with success.

The barrel is 26" SS

Thank you all for the help---Doug